The Tiny Buddha On Letting Go

"You can’t go back and change what you did before, but you can be proud of what you do with the lessons that came from it.

When you start dwelling on choices you wish you made or didn’t make, ask yourself: What did this experience teach me that will help me going forward? What insights did I gain about myself that will help me be the person I want to be?

When you focus on lessons learned, you turn a past you might otherwise regret into something ultimately useful for both your present and your future." - Tiny Buddha

The website, tinybuddha.com, is filled with lots of really great articles. I highly recommend it.